PS I2C

Hi Guys,

I want to use the PS I2C_0 to communicate through the PMOD interface. I selected the PMOD JE1. Pins JE9 and JE10 are connected to MIO14 and MIO15, so I created a design where I2C_0 is mapped to MIO14/15. I exported the design to SDK, created a BSP, and I am able to run software and see UART output.

However, when I try to use the PS I2C driver (interrupt or polled), it will cancel (interrupt) or stall forever (polled).

External pull-up is provided on both lines. The MIO14/15 IO config registers read
MIO 14: 0x00000640
MIO 15: 0x00000640
which looks okay to me.

When searching for a solution I found a chinese guy complaining about the very same problem (no solution):

http://group.chinaaet.com/109/61386

Any ideas?

Thanks in advance!

0 zedhed over 13 years ago

Hi Rasfunk,

Have you tried connecting an oscilloscope to pins JE9 and JE10 to see if there is any activity on the I2C lines?

Regards,

-Kevin
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0 Former Member over 13 years ago in reply to zedhed

Hi Kevin,
thanks for your reply. I believe there is a constant 3.3V level on both clock and data. I'll re-measure on monday.

One more thing: I am able to toggle output pins using the PS IO without any problems.
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0 Former Member over 13 years ago in reply to zedhed

Hi Kevin,
I checked everything again, and it works now. I am not 100% sure, why it didn't work in the first place, but one thing might be a too fast I2C clock frequency. However, if I remove the I2C slave, and no acknowledge arrives, the polled example still hangs forever. No timeout.
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0 Former Member over 12 years ago in reply to Former Member

hello,how did you solve this problem?I use the PS I2C driver in both two methods (interrupt or polled), but the clk and data lines are always high useing the interrupt exaple,while the the polled example is into the endless loop situation.I am very urgent to receive your help,thank you very much!could you post your correct codes here ?
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0 Former Member over 9 years ago in reply to Former Member

I am working on a similar thing and am unable to find a decent approach to this problem. PLease help with any inputs for me to start with.
Thanks
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